Is there a homebrew instrument that I can make that will let me know when
I'm out of the near field and in the far field? I'd like it to work with
mobile whips as well as dipoles on HF. The ARRL Ant HBK formula for the
boundary D between the two fields is an approximation where D = 2L^2/w where
L is ant length in same units as w, the wavelength.
tnx

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73
Hank WD5JFR